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Date: Thu, 08 Mar 2012 15:00:28 +0900
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To: "Eric W. Biederman" <ebiederm@xmission.com>
CC: Don Zickus <dzickus@redhat.com>, linux-tip-commits@vger.kernel.org,
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Subject: Re: [PATCH 2/2] boot: add early NMI counter
References: <CAE9FiQVPnO8-tuPoio0Wxv=8rjdm2tJbBk3+3ystueyYtZn9BA@mail.gmail.com> <20120216172735.GX9751@redhat.com> <CAE9FiQVhbAM9vjx-uFcuc0ndsUp0aez9_TsQHStje5G5iwYbag@mail.gmail.com> <20120216215603.GH9751@redhat.com> <m1y5s2ku36.fsf@fess.ebiederm.org> <m1fwe9bpk2.fsf@fess.ebiederm.org> <20120217195430.GO9751@redhat.com> <m1y5s07rn3.fsf@fess.ebiederm.org> <20120220151419.GU9751@redhat.com> <m1obss39a4.fsf@fess.ebiederm.org> <20120221135934.GF26998@redhat.com> <m1ipip6xe8.fsf@fess.ebiederm.org> <4F573E1C.2060909@oss.ntt.co.jp> <4F573E74.5040504@oss.ntt.co.jp> <4F573EF0.1080501@oss.ntt.co.jp> <m1399j1ysk.fsf@fess.ebiederm.org>
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On 03/08/2012 01:50 PM, Eric W. Biederman wrote:
> Fernando Luis Vázquez Cao<fernando@oss.ntt.co.jp>  writes:
>
>> Subject: [PATCH] boot: add early NMI counter
>>
>> From: Fernando Luis Vazquez Cao<fernando@oss.ntt.co.jp>
>>
>> We currently ignore early NMIs but it would be nice to be able to
>> know whether they actually occurred.
>>
>> This patch adds an early NMI counter and exports it trough
>> /proc/interrupts with the name of ENM (Early NMI).
> For a userspace interface I suspect we just want to dump the count
> into the NMI counter.
>
> It probably makes sense to have a separate variable in early boot like
> you do, but then about the time we setup the normal NMI handler move the
> NMI count over and possibly do something like reboot if that is our
> policy.

I am fine with either approach. I guess that is the x86 maintainers'
call. Ingo, Thomas, Peter, what do you think? Should I add a new
entry to /proc/interrupts or move over the early NMI count to the
existing per-cpu NMI counter?

Thanks,
Fernando